x=(-8).(-2)+(-5).(+2)+(.3,5).(-10.3)

Solution for x=(-8).(-2)+(-5).(+2)+(.3,5).(-10.3) equation:

x=(-8).(-2)+(-5).(+2)+(.3,5).(-10.3)

We simplify the equation to the form, which is simple to understand 
x=(-8).(-2)+(-5).(+2)+(.3,5).(-10.3)

Simplifying terms in parentheses
x=().(-10)+(-5).(+2)+(.3,5).(-10.3)

Simplifying terms in parentheses
x=().(-10)+().(-3)+(.3,5).(-10.3)

Remove unnecessary parentheses
x=).(-10+().(-3)+(.3,5).(-10.3)

Simplifying terms in parentheses
x=).(-10+().(-3)+(.3,5).(-10.3)

Remove unnecessary parentheses
+x=+).(-10+).(-3+(.3,5+).(-10.3+)

We move all terms containing x to the left and all other terms to the right. 
+1x=0-10-3-10.3

We simplify left and right side of the equation. 
+1x=-23.3

We divide both sides of the equation by 1 to get x. 
x=-23.3